HDG Compact 25, Operation Manual

Page: 24 / 188

3 Mode of operation – Functional description
24
Example:
Outside temperature -5 °C
Steepness 1.6
Parallel shift 5 °C
With these presumed values, you can see in “Figure 3/8 - Diagram of
the temperature of water leaving the boiler” that the heating circuit
supply temperature of the water is
67 °C .
If an indoor thermostat unit is also connected, the comparison bet-
ween the preset and the actual room temperature and the room in-
fluence factor are also included in the calculation of the required
water temperature leaving the boiler. The temperature difference is
multiplied by the room influence factor and is then added to the
preset room temperature. The room influence factor expresses how
strongly any deviation of the room temperature should affect the
water temperature leaving the boiler.
If no indoor thermostat unit is connected, the preset day and night
temperatures are used for the calculation.
O
UTSIDE TEMPERATURE
SWITCH
-
OFF
If the outside temperature exceeds the preset room temperature or
the preset outside switch-off temperature, the status of the heating
circuit changes to
OFF .
I
NDOOR THERMOSTAT UNIT
If an indoor thermostat unit is connected, the current target room
temperature is calculated from the preset day and night room tem-
peratures, the room influence factor and the current measured room
temperature.
H
EATING SYSTEMS FOR THE
HEATING CIRCUITS
In the group of parameters for the "hydraulic system", the correspon-
ding heating system is configured for each of the various heating cir-
cuits.
Figure 3/8 - Diagram of the temperature of water leaving the boiler
3.5
3.0
2.5
2.0
1.0
1.5
0.5
20 15 10 5 0 -5 -10 -15 -20
20
30
4
0
50
60
7
0
8
0
1.6
0.8
Pa
ral
lel
sh
ift
External temperature
Supp
ly temperature